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Question

Find the number of moles of N2O5 in a pure sample that contains 1 nanomole of O-atoms.

A
2×1010 moles
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B
0.2×1010 moles
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C
4×1010 moles
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D
0.4×1010 moles
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Solution

The correct option is A 2×1010 moles
5 moles of O-atoms are present in 1 mole of N2O5.
So, 1 nanomole of O-atoms will be present in
=15×109 moles of N2O5
=2×1010 moles of N2O5

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